One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(5,6)(7,11)(8,12)(9,10)(13,14,18,22)(15,20,16,19)(17,21,25,28)(23,26,24,27)(2,3)(6,10)(11,12)(13,15)(14,19)(16,18)(17,21)(20,22)(23,26)(24,27)(25,28) involution — undirected(1,2,4,3)(5,7,9,8)(6,11,10,12)(13,16,18,15)(14,20,22,19)(17,24,25,23)(21,26,28,27)(1,3,4,2)(5,7,9,8)(6,11,10,12)(13,17)(14,21)(15,23)(16,24)(18,25)(19,27)(20,26)(22,28)(5,8,9,7)(6,11,10,12)(14,22)(15,16)(21,28)(23,24)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.